Rotary snap-switch.



S. KORF.

. ROTARY SNAP SWITCH.

APPLICATION rmm mm: s, 1910.

997,563. Patented July 11,1911;

SAMUE xonr,

STATESPATENT OFFICE.

oroin'cAco, ILLINoIs AssIcNoR TO THE WI-KO ELECTRIC COMPANY, or CHICAGO,ILLINOIS, A CORPORATION or ILLINOIS.

- ROTARY SNAP-SWITCH.

Specification of Letters Patent. Patented July 11, 1911. Applicationfiled June 6,1910; Serial No. 565,383.

v i 'To all whom-it may concern:

Iif/Beit known that I, SAMUEL l ionr, a citivertical section on the linebeb -of Fi'g. 2;-

f'zenivof the United States, residing atChicago, in. the county of Cookand State of Illinois, have invented certain new and useful.Improvements in RotarySnap-Switches,

. the screw 16 is mountedthefshort vertical of which the following is aspecification.

jMy nvention relates to rotary snapswitches and its object is toprovide'a de-- vice ofthis kind of simple and compact constructionparticularly adapted 'for use in connection with electric lamp sockets.

Mydnvention isiembodied in" preferable form-in the devicehereina fterdescribed and illustrated in they accompanying drawings.

In these drawings, Figure-1- is an exterior view in elevation showingthe device. applied'to an incandescent electriclamp; Fig. 2, ahorizontalsection; liig. 3, a vertical section on the line a-aof Fig. 2;.Fig. 4,a.

Fig.5, a detail perspective of the contact ratchet wheel and contactstripsand'Fig. 6,'

'a' detail section throughihe-ratchet wheel fitted atwo-part plug,preferably "of porcelain and adapted to support the mechanism of theswitch. One part 2 of this plug has secured to it by suitablev screws ametallic lamp socket and the other part, 3, servesas an inclosing andretaining member for-the switch mechanism. The lamp socket member t-isattached to the plug member by.

means of screws, 5, 6. One of these screws 5 passes up through the plugmember 2 and makes electrical contact with an arm-8 of a-post 9,throughwhich passes a binding screw- 10, which is adapted to receive oneof the terminal wires ofthe circuit. The

other screw 6 passes through; the plugp'2 which is of suitableinsulating material and thereby insulates the screw from the "circuit. Apost 12rises from theplug adjacent to thelatte'r screw and has abinding'screw 13 to which the other terminal connects, spring metalconductor bar leg-substantially L.-shaped, has its long armiextend1ngthrough slots in the plug member 2 and in the socket'member 4 andacross-the center of the socket'so as to establish a circuit" throughthe lamp or other object towhich current is to be conducted. In the,drawcumferential wall 17 of the plug member 2 which member iscup-shaped, as shown. On

arm of a su gistantially-L-shaped spring contact strip 18,-having a'long arm 19by means of which the contact-stripis constituted a detentpawl and whichisadapted'to engage the teeth ,of a ratchetgwheeh,20,rotatably .mounted on a centrallfixedeltl biilar post 21, 5,carried by the plug-member 2hj The body of this wheel is made ,of somesuitable non- --c0nducting material such as. hard rubber or .fiberandsurroundingfi'rigfriction tight adjacent-tothe base of the plu'g memberis a circumferential. metallic conducting band 22,

radial-5 teeth. projecting therefrom, one numb'emtoffthoseiof theratchet wheel proper and "adapted-to register witheachaltermtefitootltofsaid wheel. The arm 19 of the .icontactj pawlmadewide I enough to extend of the -g conductingl band andinto engagementwith the ratchet teeth? of thejl bodyf offthcrwheel, so as toalternatelyiengage onef ,ofz the, nonconductingteeth of the wheel aloneor simultaneously engage one ofsaid rteeth' andfxone ofthecontactteethof the. conducting-band;

post 12, which connects witbonejof the terminals as'before stated,;'isan;.Lshapedlcontact detent strip 23 the inner of which terminates in atooth 23 extendingintothe path of the ratchet teeth of the wheeland thecontact teeth ofthe conducting band therewith on the rotat band. vLoosely mounted on the central post 21 above the ratchet wheel is an arm24:, carrying a ratchet pawl'25, which is adapted to engagethe teeth ofthe ratchetwheel and thereby turn the same. A forked arm 26 ion of thewheel and projects angularly from the end'of the. arm 24 and is adapted;toreceive the end .of a

chain 27 which passes through a guide sleeve"28 held. between the two.parts 2 and 3 of the plug and depends belowl'the shell and-serves asanoperating pullymember for turning the ratchet wheel to throw the switchon or oil.

Mounted on a bindingiscrewiiiirof; the

and is adapted to. makeandbreak contact.

A spiral spring 29 is mounted on the post 21, having one end bearingagainst the same and the other end bearing against the arm 24:, so as toact to retract the arni after each actuation thereof by the pull-chain.

The retaining and closing plug member 3 is adapted to fit on the edgeot'the wall of.

the cup-shaped plug member 2, and it is provided in its side wall withslots 30 to receive and engage the posts 9 and 12 and also with a slot31 to register with a corresponding slot in the plug member 2 to permitthe projection from the plug of the pull chain guidesleeve.

A. central retaining screw 32 passes through the member 3 and engagesthe central post 21 which is interiorly threaded to receive said screw.

The operation of the device is as follows: Upon a pull on the chain theratchet will be moved to turn the ratchet wheel one tooth, the movementof the arm 24 being limited by and-between the two abutment blocks 7 and11.. This movement will carry oneof the contact teeth of the conductingband 22' into contact with the contact detent pawl 18 and also carry oneof the other teeth of said band into contact with the other contactstrip 23, thereby establishing a circuit through said contact; strips,theconducting band, the two terminals, the conductor bar Hand thesocket. member. Upon releasing the pull-chain [the spring. 29 retractsthe ratchet arm and, pawl to normal position. Upon another pullon thechainthe ratchet wheel is turned another tooth so as to re move thecontact teeth of the conducting band from engagement with the strips 18and 23 and break the circuit. The detent strips 18 and 23 serve toprevent the ratchet 'wheel from moving backward and thus performs thedouble function of a detent pawl and a contact member. 1

Having thus described my invention, what I claim is,

1. An electric rotary snap-switch having a ratchet wheel, a swinging armand pawl to operate said wheel, said wheel mounted on a post out of theelectric circuit and having non-conducting teeth and having teeth ofconducting material registering with the alternate non-conducting teeth,a detent contact pawl adapted to engage both sets of teeth, an object towhich current is to be conducted and means to establish a circuitbetweensaid contact pawl and said object, substantially as described.

2. electric rotary snap switch having a cup-shaped plug member ofnon-conducting material, a ratchet wheel of non-coneo'wea v ductingmaterial centrally mounted 'on said.

plug member and having a band of conductlng material around the same,sald band having proyections corresponding with elongated teeth of theratchet wheel, contacttially as described.

4:. In-an electric rotary snap switch. a non-conducting central post. arotatable wheel of non-conducting material, a tubular extension onsaidratchet wheel, a conducting band surrounding said extension andhaving teetharranged in extension of the ratchet teeth, and conductingcontact strips adapted to simultaneously contact with two of saidconducting teeth, substantially as described. I y

5. In an electric rotary snap switch, a plug member insulated from theswitch, a central post secured to the plug, a ratchet wheel insulatedfromthe post provided with non-conducting teeth, a non-conductingextension on said ratchet, a conducting member surrounding saidextension provided with teeth in extension of the non-conducting teeth,a binder postin electrical connection with alamp, a second binder post,

"a detent contact strip in electrical connection with the same, a springmetal contact strip adapted to be engaged by a lamp, a detent'contactstrip connected thereto, said detent strips adapted to simultaneouslyengage teeth of the conducting member, a

swinging arm carrying a pawl for the ratchet, a spring surrounding thepost and bearing against the pawl, an operating member connected, tothearm and extending through the plug and depending on the exteriorthereof, the swinging movementof the arms being limited by abutmentagainst portions of the plug, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

SAMUEL KOR-F.

Witnesses:

M. E. Joxns, Jr., H. P. DooLrrrLn.

